English English Wikipedia has an article on:Janssen (surname)Wikipedia Proper noun Janssen (plural Janssens) A surname. Dutch Pronunciation IPA(key): /ˈjɑn.sə(n)/ Audio:(file) Hyphenation: Jans‧sen Proper noun Janssen alternative form of Jansen, a common surname originating as a patronymicWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads